MARKARIAN2 ivo://nasa.heasarc/markarian2 NASA/GSFC HEASARC Petrosian et al. 2026-05-08 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Galaxy A database for the entire Markarian (First Byurakan Spectral Sky Survey or FBS) Catalog is presented that combines extensive new measurements of their optical parameters with a literature and database search. The measurements were made using images extracted from the STScI Digitized Sky Survey (DSS) of F_pg (red) and J_pg (blue) band photographic sky survey plates obtained by the Palomar and UK Schmidt telescopes. The authors provide accurate coordinates, morphological type, spectral and activity classes, red and blue apparent magnitudes, apparent diameters, axial ratios, and position angles, as well as number counts of neighboring objects in a circle of radius 50 kpc. Special attention was paid to the individual descriptions of the galaxies in the original Markarian lists, which clarified many cases of misidentifications of the objects, particularly among interacting systems, larger galaxies with knots of star formation, possible stars, and cases of stars projected on galaxies. The total number of individual Markarian objects in the database is now 1544. The authors also have included redshifts which are now available for 1524 of the objectswith UV-excess radiation, as well as Galactic color excess E(B-V) values and their 2MASS or DENIS infrared magnitudes. The table also includes extensive notes that summarize information about the membership of Markarian galaxies in different systems of galaxies and about new and revised activity classes and redshifts. The new optical information on Markarian galaxies was obtained from images extracted from the STScI Digitized Sky Survey (DSS) of F_pg (red) and J_pg (blue) band photographic sky survey plates obtained by the Palomar and UK Schmidt telescopes. This table was created by the HEASARC in November 2009 based on the electronic version of the optical database of Markarian galaxies which was obtained from the CDS (their catalog J/ApJS/170/33 file table1.dat). This is a service provided by NASA HEASARC . 2007ApJS..170...33P https://heasarc.gsfc.nasa.gov/W3Browse/all/markarian2.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=markarian2& GET text/xml 180 99999 true 18.45833333 -14.84666667 0.25 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=markarian2 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_markarian2&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.25 Optical public markarian2 Markarian Galaxies Optical Database name Source Designation meta.id;meta.main char nullable class Browse Object Classification src.class short nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable jpg_mag Apparent Isophotal J_pg (Blue) Band Magnitude mag phot.mag;em.opt.B double nullable jmag The J Band Magnitude mag phot.mag;em.IR.J double nullable redshift Heliocentric Redshift src.redshift double nullable galaxy_type Activity Class src.class char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable reddening Galactic Color Excess mag phot.color.excess double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable galaxy_component Additional Galaxy Designation meta.code.multip char nullable bii Galactic Latitude degree pos.galactic.lat double nullable source_notes Additional Notes meta.note char nullable morph_type Morphology Type src.morph.type short nullable morph_type_remarks Additional Morphology Remarks meta.note char nullable fpg_mag_major_axis Major F_pg (Red) Band Diameter (arcsec) arcsec phys.angSize;src double nullable hmag The H Band Magnitude mag phot.mag;em.IR.H double nullable fpg_mag_position_angle Position Angle in F_pg Band degree pos.posAng;src short nullable jpg_mag_major_axis Major J_pg (Blue) Band Diameter (arcsec) arcsec phys.angSize;src double nullable fpg_mag_axial_ratio [0,1] Axial Ratio in F_pg (Red) Band phys.size.axisRatio double nullable fpg_mag Apparent Isophotal F_pg (Red) Band Magnitude mag phot.mag;em.opt.R double nullable num_gals_50kpc Number of Galaxies Detected within a 50kpc Projected Radius meta.number short nullable jpg_mag_position_angle Position Angle in J_pg Band degree pos.posAng;src short nullable num_gals_50kpc_flag Flag [d] Indicates No Neighbor Counts Due to Small Redshift meta.code char nullable jpg_mag_axial_ratio [0,1] Axial Ratio in J_pg (Blue) Band phys.size.axisRatio double nullable markarian_type Spectral Classification src.class char nullable kmag The K Band Magnitude mag phot.mag;em.IR.K double nullable lii Galactic Longitude degree pos.galactic.lon double nullable